Steve Aoki & Louis Tomlinson Perform 'Just Hold On' For 'Fallon': Watch

Steve Aoki and Louis Tomlinson made their late-night U.S. debut on Tonight Show Starring Jimmy Fallon last night, where they performed their party-ready tune "Just Hold On." The One Direction star showed off his soaring vocals while Aoki provided the electronic melody. 

The pop/EDM track marked the first collaboration between the two music pals, and was released back in December. Since then, it became Aoki's highest-charting tune when it peaked at No. 52 on the Billboard Hot 100. "Just Hold On" is Tomlinson's debut solo effort since 1D announced their indefinite hiatus in Aug. 2015.